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(Nd Model.) 2 sheets-sheet 1. G. S. STRONG.

LOOMOTIVBBOILER.

Patented July 10, 1888.

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2 Sheets-Sheet 2.

(No Model.)

G. S. STRONG.

LoGoMoTIv BOILEB..

Patented July 10., 1888.

Q Si M "UNITED STATES PATENT @Errea GEORGE s. sTRONG, OE NEW YORK, N'.Y.

LOCONIOTIVE-BOILER.

SPECIFICATION forming part. of Letters Patent No. 385,968, dated July10, 1888.

Application tiled April 3, 1888. Serial No. 269,468. (No model.)

T 0 all whom it may concern.'

Be it known that I, GEORGE S. STRONG, a citizen of the United States,and a resident of New York city, New York, have invented an ImprovedLocomoti ve-Boiler, of which the following is a specification.

The object of my invention is to so construct a steam-boilerforlocomotives that the largest amount of grate area may be obtained inthe simplest and strongest form of construction with the fewest possiblebraces or struts. This object I attain by combining with a cylindricalbarrel and cylindrical combustion-chamber a cylindrical tire-box shelland cylindrical firebox larger in diameter than the barrel andcombustion-chamber, respectively, and placed eccentric thereto.

In the accompanying drawings, Figure 1 is a longitudinal sectionaldiagram of the firebox end of a locomotive-boiler constructed inaccordance with my invention. Fig. 2 is a sectional plan. Fig. 3 ispartly an end view and partly a section on the line l 2, Figs. 1 and 2;and Fig. 4 is a transverse section on the line 3 4, Figs. l and 2.

A is the fire-box, and A thel fire-box shell having the usual steamdome,a.

B is the barrel, and B the combustion-chamber within the rear end of thebarrel. From the tube-sheet b in the end of the combustion- /chamberextend the tubes t, of which only a few are represented in the drawings.

By preference the nre-box and combustionchamber are madecircumferentially corrugated, as illustrated in previous patents grantedto me, No. 304,973, September 9,1884, and No. 315,974, April 14, 1885.My previouslypatented boilers I have shown and described as providedwith twin lire-boxes. In my present invention I employ only a singledre-box and shell, and in order to increase the size of thegrate-surface without unduly increasing the height of the boiler or thediameter of the barrel I make the fire-box A of considerably largerdiameter than the combustion-chamber B and the nre-box shell A ofcorrespondingly larger diameter than the vbarrel B. At the same time Ikeep not only the barrel and combustiomchamber cylindrical, but thetire-box and fire-box shell are also made cylindrical, as this shape isthe strongest to resist strains and requires the fewest braces,supports, or struts.

The cylindrical lire-box and its shell are arranged eccentrically to thecombustion-,chamber and barrel, as Awill be seen on reference to thedrawings, the lower edge of the fire-box and shell being depressed belowthe combustion-chamber and barrel, so that the drivingwheels D D may beplaced on each side of the barrel in advance of the lire-box, while thelatter is carried on a trailing-truck, T, as in dicated by dotted linesin Fig. 1.

The top of the lire-box is on a level with the top ofthecombustion-chamber, so that there may be the same depth of water overboth, while the shell of the lire-box is at its top above the level ofthe barrel, so as to give the locomotive the wagon-top form. Thefire-box is united to the combustion chamber by a junction-piece,j,Welded or riveted to the two parts at the dotted lines x x, and thetire-box shell is united to the barrel by a correspondingjunction-piece,j.

By preference I make the grate-bars of longitudinal tubes g, extendingfrom a transverse Water-box, w, to and through the lower part ofthejunction-piecej, as shown in Fig. 1, so that there can always beacirculation of water through the tubes and water-box.

I claim as my invention- 1. A locomotive-boiler having a cylindricalbarrel and combustion-chamber with a cylindrical `nre-box andcylindrical lire-box shell oflarger diameters than thecombustion-chamber and barrel, respectively, and placed eccentrically tothe latter, substantially as described.

2. A locomotive-boiler having a cylindrical barrel and combustionchamberwith a cylindrical tire-box and cylindrical tire-box shell oflargerdiameters than the combustion-chamber and barrel, respectively, and thetop of the fire-box being on a level with the top of thecombustion-chamber, substantially as described.

3. The Combination ofthe oombustiouoham- In testi molly w'heroof havesigned my immo ber and barrel with the enlarged fire-box and to thisspeoicabion in the presence of two sub shell, j unctonspieces, atransverse Waterbox sorbing Witnesses.

across the front of the fire-box, :md tubular GEO. S. STRONG. 5gratebars extending from the Water-box to the W'ibnesses:

lower pari; of the inner jl1nebion-piece,sub XV. F. DIXON,

stantialiy as set forth. J. XV. BEACH.

